466 lines
19 KiB
C++
466 lines
19 KiB
C++
//===- llvm/FixedPointBuilder.h - Builder for fixed-point ops ---*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the FixedPointBuilder class, which is used as a convenient
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// way to lower fixed-point arithmetic operations to LLVM IR.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_IR_FIXEDPOINTBUILDER_H
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#define LLVM_IR_FIXEDPOINTBUILDER_H
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#include "llvm/ADT/APFixedPoint.h"
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#include "llvm/IR/Constant.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/InstrTypes.h"
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#include "llvm/IR/Instruction.h"
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#include "llvm/IR/IntrinsicInst.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/IR/Type.h"
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#include "llvm/IR/Value.h"
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namespace llvm {
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template <class IRBuilderTy> class FixedPointBuilder {
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IRBuilderTy &B;
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Value *Convert(Value *Src, const FixedPointSemantics &SrcSema,
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const FixedPointSemantics &DstSema, bool DstIsInteger) {
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unsigned SrcWidth = SrcSema.getWidth();
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unsigned DstWidth = DstSema.getWidth();
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unsigned SrcScale = SrcSema.getScale();
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unsigned DstScale = DstSema.getScale();
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bool SrcIsSigned = SrcSema.isSigned();
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bool DstIsSigned = DstSema.isSigned();
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Type *DstIntTy = B.getIntNTy(DstWidth);
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Value *Result = Src;
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unsigned ResultWidth = SrcWidth;
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// Downscale.
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if (DstScale < SrcScale) {
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// When converting to integers, we round towards zero. For negative
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// numbers, right shifting rounds towards negative infinity. In this case,
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// we can just round up before shifting.
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if (DstIsInteger && SrcIsSigned) {
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Value *Zero = Constant::getNullValue(Result->getType());
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Value *IsNegative = B.CreateICmpSLT(Result, Zero);
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Value *LowBits = ConstantInt::get(
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B.getContext(), APInt::getLowBitsSet(ResultWidth, SrcScale));
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Value *Rounded = B.CreateAdd(Result, LowBits);
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Result = B.CreateSelect(IsNegative, Rounded, Result);
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}
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Result = SrcIsSigned
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? B.CreateAShr(Result, SrcScale - DstScale, "downscale")
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: B.CreateLShr(Result, SrcScale - DstScale, "downscale");
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}
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if (!DstSema.isSaturated()) {
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// Resize.
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Result = B.CreateIntCast(Result, DstIntTy, SrcIsSigned, "resize");
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// Upscale.
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if (DstScale > SrcScale)
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Result = B.CreateShl(Result, DstScale - SrcScale, "upscale");
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} else {
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// Adjust the number of fractional bits.
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if (DstScale > SrcScale) {
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// Compare to DstWidth to prevent resizing twice.
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ResultWidth = std::max(SrcWidth + DstScale - SrcScale, DstWidth);
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Type *UpscaledTy = B.getIntNTy(ResultWidth);
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Result = B.CreateIntCast(Result, UpscaledTy, SrcIsSigned, "resize");
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Result = B.CreateShl(Result, DstScale - SrcScale, "upscale");
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}
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// Handle saturation.
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bool LessIntBits = DstSema.getIntegralBits() < SrcSema.getIntegralBits();
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if (LessIntBits) {
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Value *Max = ConstantInt::get(
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B.getContext(),
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APFixedPoint::getMax(DstSema).getValue().extOrTrunc(ResultWidth));
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Value *TooHigh = SrcIsSigned ? B.CreateICmpSGT(Result, Max)
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: B.CreateICmpUGT(Result, Max);
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Result = B.CreateSelect(TooHigh, Max, Result, "satmax");
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}
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// Cannot overflow min to dest type if src is unsigned since all fixed
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// point types can cover the unsigned min of 0.
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if (SrcIsSigned && (LessIntBits || !DstIsSigned)) {
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Value *Min = ConstantInt::get(
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B.getContext(),
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APFixedPoint::getMin(DstSema).getValue().extOrTrunc(ResultWidth));
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Value *TooLow = B.CreateICmpSLT(Result, Min);
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Result = B.CreateSelect(TooLow, Min, Result, "satmin");
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}
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// Resize the integer part to get the final destination size.
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if (ResultWidth != DstWidth)
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Result = B.CreateIntCast(Result, DstIntTy, SrcIsSigned, "resize");
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}
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return Result;
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}
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/// Get the common semantic for two semantics, with the added imposition that
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/// saturated padded types retain the padding bit.
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FixedPointSemantics
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getCommonBinopSemantic(const FixedPointSemantics &LHSSema,
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const FixedPointSemantics &RHSSema) {
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auto C = LHSSema.getCommonSemantics(RHSSema);
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bool BothPadded =
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LHSSema.hasUnsignedPadding() && RHSSema.hasUnsignedPadding();
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return FixedPointSemantics(
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C.getWidth() + (unsigned)(BothPadded && C.isSaturated()), C.getScale(),
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C.isSigned(), C.isSaturated(), BothPadded);
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}
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/// Given a floating point type and a fixed-point semantic, return a floating
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/// point type which can accommodate the fixed-point semantic. This is either
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/// \p Ty, or a floating point type with a larger exponent than Ty.
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Type *getAccommodatingFloatType(Type *Ty, const FixedPointSemantics &Sema) {
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const fltSemantics *FloatSema = &Ty->getFltSemantics();
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while (!Sema.fitsInFloatSemantics(*FloatSema))
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FloatSema = APFixedPoint::promoteFloatSemantics(FloatSema);
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return Type::getFloatingPointTy(Ty->getContext(), *FloatSema);
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}
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public:
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FixedPointBuilder(IRBuilderTy &Builder) : B(Builder) {}
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/// Convert an integer value representing a fixed-point number from one
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/// fixed-point semantic to another fixed-point semantic.
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/// \p Src - The source value
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/// \p SrcSema - The fixed-point semantic of the source value
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/// \p DstSema - The resulting fixed-point semantic
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Value *CreateFixedToFixed(Value *Src, const FixedPointSemantics &SrcSema,
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const FixedPointSemantics &DstSema) {
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return Convert(Src, SrcSema, DstSema, false);
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}
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/// Convert an integer value representing a fixed-point number to an integer
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/// with the given bit width and signedness.
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/// \p Src - The source value
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/// \p SrcSema - The fixed-point semantic of the source value
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/// \p DstWidth - The bit width of the result value
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/// \p DstIsSigned - The signedness of the result value
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Value *CreateFixedToInteger(Value *Src, const FixedPointSemantics &SrcSema,
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unsigned DstWidth, bool DstIsSigned) {
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return Convert(
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Src, SrcSema,
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FixedPointSemantics::GetIntegerSemantics(DstWidth, DstIsSigned), true);
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}
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/// Convert an integer value with the given signedness to an integer value
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/// representing the given fixed-point semantic.
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/// \p Src - The source value
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/// \p SrcIsSigned - The signedness of the source value
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/// \p DstSema - The resulting fixed-point semantic
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Value *CreateIntegerToFixed(Value *Src, unsigned SrcIsSigned,
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const FixedPointSemantics &DstSema) {
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return Convert(Src,
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FixedPointSemantics::GetIntegerSemantics(
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Src->getType()->getScalarSizeInBits(), SrcIsSigned),
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DstSema, false);
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}
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Value *CreateFixedToFloating(Value *Src, const FixedPointSemantics &SrcSema,
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Type *DstTy) {
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Value *Result;
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Type *OpTy = getAccommodatingFloatType(DstTy, SrcSema);
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// Convert the raw fixed-point value directly to floating point. If the
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// value is too large to fit, it will be rounded, not truncated.
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Result = SrcSema.isSigned() ? B.CreateSIToFP(Src, OpTy)
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: B.CreateUIToFP(Src, OpTy);
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// Rescale the integral-in-floating point by the scaling factor. This is
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// lossless, except for overflow to infinity which is unlikely.
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Result = B.CreateFMul(Result,
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ConstantFP::get(OpTy, std::pow(2, -(int)SrcSema.getScale())));
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if (OpTy != DstTy)
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Result = B.CreateFPTrunc(Result, DstTy);
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return Result;
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}
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Value *CreateFloatingToFixed(Value *Src, const FixedPointSemantics &DstSema) {
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bool UseSigned = DstSema.isSigned() || DstSema.hasUnsignedPadding();
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Value *Result = Src;
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Type *OpTy = getAccommodatingFloatType(Src->getType(), DstSema);
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if (OpTy != Src->getType())
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Result = B.CreateFPExt(Result, OpTy);
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// Rescale the floating point value so that its significant bits (for the
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// purposes of the conversion) are in the integral range.
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Result = B.CreateFMul(Result,
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ConstantFP::get(OpTy, std::pow(2, DstSema.getScale())));
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Type *ResultTy = B.getIntNTy(DstSema.getWidth());
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if (DstSema.isSaturated()) {
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Intrinsic::ID IID =
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UseSigned ? Intrinsic::fptosi_sat : Intrinsic::fptoui_sat;
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Result = B.CreateIntrinsic(IID, {ResultTy, OpTy}, {Result});
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} else {
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Result = UseSigned ? B.CreateFPToSI(Result, ResultTy)
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: B.CreateFPToUI(Result, ResultTy);
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}
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// When saturating unsigned-with-padding using signed operations, we may
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// get negative values. Emit an extra clamp to zero.
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if (DstSema.isSaturated() && DstSema.hasUnsignedPadding()) {
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Constant *Zero = Constant::getNullValue(Result->getType());
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Result =
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B.CreateSelect(B.CreateICmpSLT(Result, Zero), Zero, Result, "satmin");
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}
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return Result;
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}
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/// Add two fixed-point values and return the result in their common semantic.
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/// \p LHS - The left hand side
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/// \p LHSSema - The semantic of the left hand side
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/// \p RHS - The right hand side
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/// \p RHSSema - The semantic of the right hand side
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Value *CreateAdd(Value *LHS, const FixedPointSemantics &LHSSema,
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Value *RHS, const FixedPointSemantics &RHSSema) {
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auto CommonSema = getCommonBinopSemantic(LHSSema, RHSSema);
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bool UseSigned = CommonSema.isSigned() || CommonSema.hasUnsignedPadding();
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Value *WideLHS = CreateFixedToFixed(LHS, LHSSema, CommonSema);
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Value *WideRHS = CreateFixedToFixed(RHS, RHSSema, CommonSema);
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Value *Result;
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if (CommonSema.isSaturated()) {
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Intrinsic::ID IID = UseSigned ? Intrinsic::sadd_sat : Intrinsic::uadd_sat;
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Result = B.CreateBinaryIntrinsic(IID, WideLHS, WideRHS);
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} else {
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Result = B.CreateAdd(WideLHS, WideRHS);
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}
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return CreateFixedToFixed(Result, CommonSema,
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LHSSema.getCommonSemantics(RHSSema));
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}
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/// Subtract two fixed-point values and return the result in their common
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/// semantic.
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/// \p LHS - The left hand side
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/// \p LHSSema - The semantic of the left hand side
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/// \p RHS - The right hand side
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/// \p RHSSema - The semantic of the right hand side
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Value *CreateSub(Value *LHS, const FixedPointSemantics &LHSSema,
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Value *RHS, const FixedPointSemantics &RHSSema) {
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auto CommonSema = getCommonBinopSemantic(LHSSema, RHSSema);
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bool UseSigned = CommonSema.isSigned() || CommonSema.hasUnsignedPadding();
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Value *WideLHS = CreateFixedToFixed(LHS, LHSSema, CommonSema);
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Value *WideRHS = CreateFixedToFixed(RHS, RHSSema, CommonSema);
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Value *Result;
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if (CommonSema.isSaturated()) {
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Intrinsic::ID IID = UseSigned ? Intrinsic::ssub_sat : Intrinsic::usub_sat;
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Result = B.CreateBinaryIntrinsic(IID, WideLHS, WideRHS);
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} else {
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Result = B.CreateSub(WideLHS, WideRHS);
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}
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// Subtraction can end up below 0 for padded unsigned operations, so emit
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// an extra clamp in that case.
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if (CommonSema.isSaturated() && CommonSema.hasUnsignedPadding()) {
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Constant *Zero = Constant::getNullValue(Result->getType());
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Result =
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B.CreateSelect(B.CreateICmpSLT(Result, Zero), Zero, Result, "satmin");
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}
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return CreateFixedToFixed(Result, CommonSema,
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LHSSema.getCommonSemantics(RHSSema));
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}
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/// Multiply two fixed-point values and return the result in their common
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/// semantic.
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/// \p LHS - The left hand side
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/// \p LHSSema - The semantic of the left hand side
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/// \p RHS - The right hand side
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/// \p RHSSema - The semantic of the right hand side
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Value *CreateMul(Value *LHS, const FixedPointSemantics &LHSSema,
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Value *RHS, const FixedPointSemantics &RHSSema) {
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auto CommonSema = getCommonBinopSemantic(LHSSema, RHSSema);
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bool UseSigned = CommonSema.isSigned() || CommonSema.hasUnsignedPadding();
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Value *WideLHS = CreateFixedToFixed(LHS, LHSSema, CommonSema);
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Value *WideRHS = CreateFixedToFixed(RHS, RHSSema, CommonSema);
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Intrinsic::ID IID;
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if (CommonSema.isSaturated()) {
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IID = UseSigned ? Intrinsic::smul_fix_sat : Intrinsic::umul_fix_sat;
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} else {
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IID = UseSigned ? Intrinsic::smul_fix : Intrinsic::umul_fix;
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}
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Value *Result = B.CreateIntrinsic(
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IID, {WideLHS->getType()},
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{WideLHS, WideRHS, B.getInt32(CommonSema.getScale())});
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return CreateFixedToFixed(Result, CommonSema,
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LHSSema.getCommonSemantics(RHSSema));
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}
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/// Divide two fixed-point values and return the result in their common
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/// semantic.
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/// \p LHS - The left hand side
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/// \p LHSSema - The semantic of the left hand side
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/// \p RHS - The right hand side
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/// \p RHSSema - The semantic of the right hand side
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Value *CreateDiv(Value *LHS, const FixedPointSemantics &LHSSema,
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Value *RHS, const FixedPointSemantics &RHSSema) {
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auto CommonSema = getCommonBinopSemantic(LHSSema, RHSSema);
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bool UseSigned = CommonSema.isSigned() || CommonSema.hasUnsignedPadding();
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Value *WideLHS = CreateFixedToFixed(LHS, LHSSema, CommonSema);
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Value *WideRHS = CreateFixedToFixed(RHS, RHSSema, CommonSema);
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Intrinsic::ID IID;
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if (CommonSema.isSaturated()) {
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IID = UseSigned ? Intrinsic::sdiv_fix_sat : Intrinsic::udiv_fix_sat;
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} else {
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IID = UseSigned ? Intrinsic::sdiv_fix : Intrinsic::udiv_fix;
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}
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Value *Result = B.CreateIntrinsic(
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IID, {WideLHS->getType()},
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{WideLHS, WideRHS, B.getInt32(CommonSema.getScale())});
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return CreateFixedToFixed(Result, CommonSema,
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LHSSema.getCommonSemantics(RHSSema));
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}
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/// Left shift a fixed-point value by an unsigned integer value. The integer
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/// value can be any bit width.
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/// \p LHS - The left hand side
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/// \p LHSSema - The semantic of the left hand side
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/// \p RHS - The right hand side
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Value *CreateShl(Value *LHS, const FixedPointSemantics &LHSSema, Value *RHS) {
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bool UseSigned = LHSSema.isSigned() || LHSSema.hasUnsignedPadding();
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RHS = B.CreateIntCast(RHS, LHS->getType(), /*IsSigned=*/false);
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Value *Result;
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if (LHSSema.isSaturated()) {
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Intrinsic::ID IID = UseSigned ? Intrinsic::sshl_sat : Intrinsic::ushl_sat;
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Result = B.CreateBinaryIntrinsic(IID, LHS, RHS);
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} else {
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Result = B.CreateShl(LHS, RHS);
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}
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return Result;
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}
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/// Right shift a fixed-point value by an unsigned integer value. The integer
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/// value can be any bit width.
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/// \p LHS - The left hand side
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/// \p LHSSema - The semantic of the left hand side
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/// \p RHS - The right hand side
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Value *CreateShr(Value *LHS, const FixedPointSemantics &LHSSema, Value *RHS) {
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RHS = B.CreateIntCast(RHS, LHS->getType(), false);
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return LHSSema.isSigned() ? B.CreateAShr(LHS, RHS) : B.CreateLShr(LHS, RHS);
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}
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/// Compare two fixed-point values for equality.
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/// \p LHS - The left hand side
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/// \p LHSSema - The semantic of the left hand side
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/// \p RHS - The right hand side
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/// \p RHSSema - The semantic of the right hand side
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Value *CreateEQ(Value *LHS, const FixedPointSemantics &LHSSema,
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Value *RHS, const FixedPointSemantics &RHSSema) {
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auto CommonSema = getCommonBinopSemantic(LHSSema, RHSSema);
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Value *WideLHS = CreateFixedToFixed(LHS, LHSSema, CommonSema);
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Value *WideRHS = CreateFixedToFixed(RHS, RHSSema, CommonSema);
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return B.CreateICmpEQ(WideLHS, WideRHS);
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}
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/// Compare two fixed-point values for inequality.
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/// \p LHS - The left hand side
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/// \p LHSSema - The semantic of the left hand side
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/// \p RHS - The right hand side
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/// \p RHSSema - The semantic of the right hand side
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Value *CreateNE(Value *LHS, const FixedPointSemantics &LHSSema,
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Value *RHS, const FixedPointSemantics &RHSSema) {
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auto CommonSema = getCommonBinopSemantic(LHSSema, RHSSema);
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Value *WideLHS = CreateFixedToFixed(LHS, LHSSema, CommonSema);
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Value *WideRHS = CreateFixedToFixed(RHS, RHSSema, CommonSema);
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return B.CreateICmpNE(WideLHS, WideRHS);
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}
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/// Compare two fixed-point values as LHS < RHS.
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/// \p LHS - The left hand side
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/// \p LHSSema - The semantic of the left hand side
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/// \p RHS - The right hand side
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/// \p RHSSema - The semantic of the right hand side
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Value *CreateLT(Value *LHS, const FixedPointSemantics &LHSSema,
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Value *RHS, const FixedPointSemantics &RHSSema) {
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auto CommonSema = getCommonBinopSemantic(LHSSema, RHSSema);
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Value *WideLHS = CreateFixedToFixed(LHS, LHSSema, CommonSema);
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Value *WideRHS = CreateFixedToFixed(RHS, RHSSema, CommonSema);
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return CommonSema.isSigned() ? B.CreateICmpSLT(WideLHS, WideRHS)
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: B.CreateICmpULT(WideLHS, WideRHS);
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}
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/// Compare two fixed-point values as LHS <= RHS.
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/// \p LHS - The left hand side
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/// \p LHSSema - The semantic of the left hand side
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/// \p RHS - The right hand side
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/// \p RHSSema - The semantic of the right hand side
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Value *CreateLE(Value *LHS, const FixedPointSemantics &LHSSema,
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Value *RHS, const FixedPointSemantics &RHSSema) {
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auto CommonSema = getCommonBinopSemantic(LHSSema, RHSSema);
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Value *WideLHS = CreateFixedToFixed(LHS, LHSSema, CommonSema);
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Value *WideRHS = CreateFixedToFixed(RHS, RHSSema, CommonSema);
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return CommonSema.isSigned() ? B.CreateICmpSLE(WideLHS, WideRHS)
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: B.CreateICmpULE(WideLHS, WideRHS);
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}
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/// Compare two fixed-point values as LHS > RHS.
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/// \p LHS - The left hand side
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/// \p LHSSema - The semantic of the left hand side
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/// \p RHS - The right hand side
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/// \p RHSSema - The semantic of the right hand side
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Value *CreateGT(Value *LHS, const FixedPointSemantics &LHSSema,
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Value *RHS, const FixedPointSemantics &RHSSema) {
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auto CommonSema = getCommonBinopSemantic(LHSSema, RHSSema);
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Value *WideLHS = CreateFixedToFixed(LHS, LHSSema, CommonSema);
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Value *WideRHS = CreateFixedToFixed(RHS, RHSSema, CommonSema);
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return CommonSema.isSigned() ? B.CreateICmpSGT(WideLHS, WideRHS)
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: B.CreateICmpUGT(WideLHS, WideRHS);
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}
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/// Compare two fixed-point values as LHS >= RHS.
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/// \p LHS - The left hand side
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/// \p LHSSema - The semantic of the left hand side
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/// \p RHS - The right hand side
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/// \p RHSSema - The semantic of the right hand side
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Value *CreateGE(Value *LHS, const FixedPointSemantics &LHSSema,
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Value *RHS, const FixedPointSemantics &RHSSema) {
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auto CommonSema = getCommonBinopSemantic(LHSSema, RHSSema);
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Value *WideLHS = CreateFixedToFixed(LHS, LHSSema, CommonSema);
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Value *WideRHS = CreateFixedToFixed(RHS, RHSSema, CommonSema);
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return CommonSema.isSigned() ? B.CreateICmpSGE(WideLHS, WideRHS)
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: B.CreateICmpUGE(WideLHS, WideRHS);
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}
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};
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} // end namespace llvm
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#endif // LLVM_IR_FIXEDPOINTBUILDER_H
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